Saving messages
With most device models, copies of sent messages are automatically stored to your device’s Sent folder. When composing a message, you can also save a draft message without sending it. Only messages with content (text, media files, or recipients) can be saved.
To save a message, click Save message in the message editor dialog box. The message is saved to the Drafts folder in the Messages view.
Note:
When you save an existing draft, it is stored to the same location from where you opened it. Saving overwrites the old message.